I have now planted my little ones in the final pot.... the taproots have grown very well, but unfortunately, there was some white hairy stuff on them. Could have been a fungus. How do I get rid of it?
Do you have a picture? Else it will be difficult to tell. If it's white around the base before the roots start, it could be a buildup of salts from the fertilizer, but without seeing it, and only based on your description it's not really possible to say anything..
I found out they are mushrooms, but friendly ones that help the plant gather nutrients. Unfortunately, I don't have a photo; I made sure to get the babies back into the soil right away.